microRNA and quantitative real-time RT-PCR - Micro-RNA: A tiny piece of RNA, about 21 to 23 bases in length, that binds to matching pieces of messenger RNA to make it double-stranded and decrease the production of the corresponding protein. Micro-RNA\\\'s were first discovered in the roundworm C. elegans in the early 1990s and are now known in many species, including humans. - gene-quantification.info